Air Ducts Friction Loss Diagram

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Major loss diagram air ducts - Imperial units 10 - 100 000 cfm

Estimate friction loss (head loss) in standard air ducts can be estimated with the diagram below:

air ductwork friction loss diagram

The diagram is based on standard air 0.075 lb/ft³ in clean round galvanized metal ducts.

1 inch water = 248.8 N/m²(Pa)= 0.0361 lb/in² (psi) = 25.4 kg/m² = 0.0739 in mercury
1 ft³/min (cfm) = 1.7 m³/h = 0.47 l/s
1 ft/min = 5.08x10^-3 m/s
1 inch = 25.4 mm = 2.54 cm = 0.0254 m = 0.08333 ft

Example - Friction Loss in Air Duct

The friction loss in a 20 inches duct with air flow 4000 cfm can be estimated to aprox. 0.23 inches water per 100 feet duct as shown in the diagram below. The air velocity can be estimated to aprox. 1850 feet per minute.

ductworks friction loss diagram example

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